mirror of git://git.gnupg.org/gnupg.git
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/* mdfilter.c - filter data and calculate a message digest
|
|
* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
|
|
*
|
|
* This file is part of GnuPG.
|
|
*
|
|
* GnuPG is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GnuPG is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
#include "gpg.h"
|
|
#include "../common/status.h"
|
|
#include "../common/iobuf.h"
|
|
#include "../common/util.h"
|
|
#include "filter.h"
|
|
|
|
|
|
|
|
/****************
|
|
* This filter is used to collect a message digest
|
|
*/
|
|
int
|
|
md_filter( void *opaque, int control,
|
|
IOBUF a, byte *buf, size_t *ret_len)
|
|
{
|
|
size_t size = *ret_len;
|
|
md_filter_context_t *mfx = opaque;
|
|
int i, rc=0;
|
|
|
|
if( control == IOBUFCTRL_UNDERFLOW ) {
|
|
if( mfx->maxbuf_size && size > mfx->maxbuf_size )
|
|
size = mfx->maxbuf_size;
|
|
i = iobuf_read( a, buf, size );
|
|
if( i == -1 ) i = 0;
|
|
if( i ) {
|
|
gcry_md_write(mfx->md, buf, i );
|
|
if( mfx->md2 )
|
|
gcry_md_write(mfx->md2, buf, i );
|
|
}
|
|
else
|
|
rc = -1; /* eof */
|
|
*ret_len = i;
|
|
}
|
|
else if( control == IOBUFCTRL_DESC )
|
|
mem2str (buf, "md_filter", *ret_len);
|
|
return rc;
|
|
}
|
|
|
|
|
|
void
|
|
free_md_filter_context( md_filter_context_t *mfx )
|
|
{
|
|
gcry_md_close(mfx->md);
|
|
gcry_md_close(mfx->md2);
|
|
mfx->md = NULL;
|
|
mfx->md2 = NULL;
|
|
mfx->maxbuf_size = 0;
|
|
}
|